Bolt-anchor.



C. J. CLEMENTS.

BOLT ANCHOR.

APPLIGATION FILED JUNE 1s, 1908.

2 SHEETS-SHEET l. Figa a Patente June M, ww.

C. J. (LMENTS.

BOLT ANCHOR.

APPLICATION HLED JUNE 16, 190s.

Q@ m Patented um 14? im.

2 SH-EETS-SHBBT 2 @g5 Eig. f

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CHARLES J. (LMENTS, OF NEW EMRK.

BOLT-ANCHOR.

ceases.

Specification of Letters Patent. ttigmted Jun@ j jg Qn] 1 Applicationtiled June 16, 1908. Serial No. 438,752.

To all whom it may concern:

Beit known that l, Cremers J. tlnnuiixrs,

a citizen ot the United States, and a resident of the borough otBrooklyn, county of Kings, city and State ot New York, have inventedcertain new and useful improvements in Bolt-Anchors, of wl ich thefollowing is a speciti 'ation accompanied hy drawings.

'lhis invention relates to a new holt anchor or expansion shield, andthe ohjeets of the invention are to improve upon the construction otsuch devices, increase their etliciency of operation 'and produce adevice which is light and rong and cheap to inanufacture.

. Further objects of the invention will hereinafter appear, and to theseends the invention consists of a holt anchor substantially lashereinafter fully described and claimed in this specification and shownin the accompanying drawings, in which- Figure l is a side elevation ot'a device embodying the invention; Fig. 2 is an interior elevation ofone-half of the shield separated on the line A, .i of Fig. 4'; Fig. 3 isa longitudinal sectional view on the line B, il oi Fig. l; and Fig. 4 isa transverse sectional view on the line C, C of Fig. 2; Fig. 5 is alongitudinal sectional view of a modification ot' the device in whichthe threads are arranged in grfnips, Fig. t3 is a longitudinal sectionalview of a modification of Fig'. Fig. 7 is a longitudinal sectional Viewof another inoditication; Fig. 8 is a longitudinal sectional view oi amodification of Fig. 7; Fig. t) is a longitudinal sectional view of amodification, having tapering walls; and Fig. l() is a longitudinalsectional View ot' a modification of Fig. 9.

Referring to ,the drawings, Figs. 1 to 4, A and B represent. thesections of the. shield and C represents the holt for expanding saidshield or anchor. The shield may he made out; of one or more sections asdesired, and in accordance with this invention, the walls of eachsection are of approximately uniform thickness throughout, and areprovided, with interior screw threads. The interior bore ot the shieldtapers toward the inner end and this taper is obtained hy increasinglthe height of the threads D as illustrated in the drawings. As the holtis screwed into the sections they are expanded74 to enalile the anchorto grip tightly the. aperture into which it is inserted. By .securingthe tapering here hy ineaus ot the. threads ot progressively increasing;t height, it is possilile to' construct the sections with wallsof uniform thickness, thus uuikiugr the sections lighter than heretotoreand more resilient and better able to withstand vihration and jarswithout looseningr the holt. llach section is pretci'ahly provided withauon-threaded portion E at. its outer eud and the eXterioi-s of the see.-tionsl are provided with rings l", or other projections, in order toobtain a hold in the wall or other place ot use. Lua-s li are providedfor prevent ine` lrme'itudinai and transverse movement ot the sections.des show-n the lugs are provided on one section and they project overtheother section, and are seated in recesses therein.

ln' Figs. 5 to 8 inclusive, modifications of the. device are shown inwhich the walls of the sections are ot substantially uniform thicknessas before. In Fig. 5 the tapering screw threaded here is obtained bymeans of groups of higher and lower threads, the higher threads .lincreasing in. height toward the inner end of the anchor, and the loweror depressed threads K being arranged loetween the groups of higherthreads. 'The intermediate groups of lower threads in crease thestrength ofthe anchor and this increase of strength inay also heobtained by the construction shown iu t5, in which strengthening ribs liare shown between the groups of threads J'. These ribs may be of 'anysuitable forin and are .shown in this instance extending longitudinallyof the dcvice,-but, they may, if desired, consist of transverse ridges,spiral ridges, or they may, he formed by crimping the walls of thesections.

ln Fign?, the screw threaded bore is obtained oy corrilg'ating the metalof the sections to form the interior threads or corrugations (l andexterior corrugations P. As stated, the walls are of uniform thicknessand the tapering coreris obtained by yiiicreasing the height of thecorrugationst 0 toward the inner end of the anchor. #According to thisconstruction, the planes of the summits or tops of the outercorrugations P are substantially parallel to the axis of the bore toenable the anchor to be placed in a cylindrical aperture and expandedtherein.

ln ltig. 8, the corrugations are arranged in groups, andthe highercorrugations Q. in

'interior tapering screw crease inheight toward the inner end of theanchor. Between the groups of higher corrugations"v are provided the4lower or depressed corrugat-ions R for strengthening purposes. Insteadet corrugations R, the sections may be strengthened by means-of ribs orridges as in llig. G.

yln Figs. 9 and l0, the Walls S of the sections are shown taperinginstead of uniform in thickness and the interior screw threads arearranged in groups of higher threads T and lower threads U, but in thisinstance, the higher threads are of uniform height. In Fig. l0,strengthening ridges or ribs V provided between the groups of higherthreads.

l claiin and desire to obtain hy Letters Patent the following:

l. A holt anchor having outwardly cylindrical walls ol uniformthickness, and a tapering screw threaded here.

An anchor holt having outwardly cylindrical walls of uniform thickness,and an interior tapering bore obtained by screw threads of progressivelyincreasing height toward one end of the anchor.

3. il. bolt anchor having outwardly-cylindrical walls or uniformthickness, and an threaded here, said screw threads progressivelyvarying in height. Y f

4t. l bolt anchor having outwardly cylindrical walls of uniformthickness, and a ta pering bore formed h; screw threads of varyingheight, one end of said bore heilig unscrew threaded and anchor beingprovided w th annular pro- 'jectlons a plirality outwardly cylin- A holtanchor, comprising of sections, each having Lirical wellsI of uh 'erinthickness, and a tapering bore formed by screw threads of varyingheight, the e.\:terior of the anchor being provided with annularcorrngations.

G i' hhlttairehor having outwardly cylindrical walls'of uniformthickness, and atapering here termedV by screw threads of varyingl'ieight.

7. fr colt anchor having outwardly cylindrical walls of uniformthickness and a tapering screw threaded here having groups the exteriorof the` senese l of threads increasing in height toward one 9. A boltanchor having outwardly cylindrical walls parallel to the axis of thebore and of uniform thickness7 and interior threads increasing in heighttoward one end.

l0. A holt anchor having outwardly cylindrical wa is ci".- unit'orinthickness and e tapering screw threaded here having groups of higher andlower threads, the pitch dia1n- -cter of the higher threads decreasingt0- ward one end.

l1. A bolt anchor provided. with or' interior engaging threads andstrength ening ribs ar anged between said groups of threads.

1Q. A holt anchor provided with groen." ot interlor threads andstrengthening ribs arranged longitudinally lietween' said groups oftin-ends.

13. A bolt anchor comprising a plurelity of sections, each sectionhaving a main hody ,portion or base of uniform thickness and ofcylindrical exterior contour, the interior heing screw threaded andforming a.` tapering bore by a progressive increase inthe height of thethreads toward one end of the anchor, the exterior of each lug annularcorrugations.`

ll. .il holt anchor comprising e plurality ot' sections, having mainbody 'portions or bases o'nniforin thickness throughout, and exteriorlycj'indrical, the interior of each si tion having wscrew threadsprogresfvely 'varying in height to form a tapcrii'ig here, the bases ofthe threads being at a uniform distance from the axis of the here, endthe exterior of the sections having annular corrugations.

ln testimony whereof l have signed this specification in the presenceoi' two suhscribing witnesses.

CHARLES J. Clildlifillll'. TWitnesses: y Enw. A. STULA,

l. B. Moons.

threads increasing in height toward one end.,

groups section having register-

